Pwcnt Link Aggregation

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LINK

AGGREGATIONINTEROPERABILITY

OF THE DELL™

POWERCONNECT™

6200 SERIES

WITH CISCO IOS OR CISCO

CATOS BASED SWITCHES

By Bruce Holmes



CONTENTS

INTRODUCTION 3

LINK AGGREGATION WITH GIGABIT ETHERNET CISCO SWITCHES 4

CONFIGURING THE 6200 SERIES SWITCH PORTS FOR DYNAMICLINK AGGREGATION

5

CONFIGURING A CISCO CATOS GIGABIT ETHERNET SWITCH FOR DYNAMICLINK AGGREGATION

7

CONFIRMING A SUCCESSFUL DYNAMIC LINK AGGREGATION CONNECTIONWITH THE 6200 SERIES SWITCH

7

CONFIRMING A SUCCESSFUL DYNAMIC LINK AGGREGATION CONNECTIONWITH CISCO IOS

8

CONFIRMING A SUCCESSFUL DYNAMIC LINK AGGREGATION CONNECTIONWITH CISCO CATOS

8

CONFIGURING THE 6200 SERIES PORT FOR STATIC LINK AGGREGATION 9

CONFIGURING A CISCO IOS SWITCH FOR STATIC LINK AGGREGATION 10

CONFIGURING A CICSO CATOS SWITCH FOR STATIC LINK AGGREGATION 10

CONFIRMING A SUCCESSFUL STATIC LINK AGGREGATION CONNECTION 11

LINK AGGREGATION WITH CISCO FAST ETHERNET SWITCHES 11

CONFIGURATION LIMITATIONS 13

CISCO AND DELL PORT CONFIGURATION DIFFERENCES 13

CISCO AND DELL LAG DISTRIBUTION CONFIGURATION 14

CONFIGURING A CISCO IOS GIGABIT ETHERNET SWITCH FOR DYNAMICLINK AGGREGATION

6



3APRIL 2008

LINK AGGREGATION INTEROPERABILITY OF THE DELL POWERCONNECT 6200 SERIES SWITCH

3

INTRODUCTION

This paper describes how to configure the Dell™ PowerConnect™ 6200 Series GigabitEthernet switch to interoperate and connect with Cisco IOS based switches when usingindustry standard link aggregation groups (LAGs) that adhere to the IEE 802.3ad standard.This paper discusses both static and dynamic LAGs. The PowerConnect 6200 Series switches

include the PC6224, PC6248, PC6224P, PC6248P, PC6224F, and M6220.

The table below shows some of the terms used to refer to LAGs in Dell and Cisco documenta-tion. This paper will use the term LAG.

DELL POWERCONNECT CISCO IOS/CATOS

Link Aggregation Groups (LAGs)EtherChannelFast EtherChannel (FEC)Gigabit EtherChannel (GEC)

Port-channel Channeling

Channel-group Channel-group

The primary purpose of LAGs is to increase the overall bandwidth between two switches. Thisis accomplished by effectively aggregating multiple ports together that act as a single, logicalconnection between the two switches.

The IEEE 802.3ad standard-based link aggregation implemented on the PowerConnect 6200Series switch is interoperable with Cisco EtherChannel using both static and dynamicconfiguration (dynamic via LACP, not the Cisco proprietary PAgP). Dell is a member of theUniversity of New Hampshire Interoperability Lab, where all PowerConnect products are testedto confirm interoperability with other Consortium members. Included in these tests is linkaggregation interoperability with other Consortium members. Additional information regardingUNH’s link aggregation testing can be found at:

ftp://ftp.iol.unh.edu/pub/bfc/testsuites/la.io.test.suite.pdf

Link aggregation can be configured as either dynamic or static. Dynamic configuration is

supported using the IEEE 802.3ad standard, which is known as Link Aggregation ControlProtocol (LACP). Static configuration is used when connecting the Dell PowerConnect 6200Series Gigabit Ethernet switch to an external Gigabit Ethernet switch that does not supportLACP. One advantage of LACP is that the protocol enables the Gigabit Ethernet switch toconfirm that the external switch is also configured for link aggregation. When using staticconfiguration, a cabling or configuration mistake involving the Dell PowerConnect 6200 Seriesswitch or the external switch could go undetected and thus cause undesirable networkbehavior. Both static and dynamic LAGs (via LACP) can detect physical link failures within theLAG and continue forwarding traffic through the other connected links within that same LAG.LACP can also detect switch or port failures that do not result in loss of link. This provides amore resilient LAG. Best practices suggest using dynamic link aggregation instead of static linkaggregation.

The configuration examples in this document use the command line interface (CLI) on eachswitch. For more detailed information about the commands, see the Dell™ PowerConnect™

6200 Series CLI Reference Guide . The “Port Channel Commands” section containsinformation about configuring LAGs by using the CLI.

If desired, any of the example configurations can be performed on the Dell PowerConnect6200 Series switch by using the Web Based Interface (WBI) as well. See theDell PowerConnect 6200 Series User's Guide for a description of the Dell WBI. For informationabout configuring LAGs by using the WBI, see the “Aggregating Ports” section in the“Configuring Switching Information” chapter.



4APRIL 2008


The Dell PowerConnect 6200 Series CLI Reference Guide and the Dell PowerConnect 6200

Series User's Guide are located on the Dell support website:

http://support.dell.com/support/edocs/network/pc62xx/en/index.htm

LINK AGGREGATION WITH GIGABIT ETHERNET CISCO SWITCHES

The examples in this document show minimal configurations necessary to establish a LAGbetween a Cisco IOS Gigabit Ethernet switch (Catalyst 3750), Cisco CatOS Ethernet switch(Catalyst 6509) and the Dell PowerConnect 6200 Series switch. These commands workwithout issue when starting from a default configuration of the switches.

To set the Dell PowerConnect 6200 Series switch to the default configuration, use the followingcommands:

NOTE: This will erase any configuration data previously configured and reboot the switch. Theswitch IP address returns to the factory default (192.168.2.1).

PC6248# clear config

PC6248# reload

From the Web interface, click the Restore Configuration Factory Default option on theSystem > File Management > Copy Files page, and then click Apply Changes.



5APRIL 2008


To set a Cisco IOS based switch to the default configuration, use the following commands:

NOTE: This will erase any configuration data previously configured and reboot the switch.

3750# delete flash:/config.text

3750# reload

To set a Cisco CatOS based switch (e.g. Catalyst 6509) to default configuration, use thefollowing commands:

NOTE: This will erase any configuration data previously configured and reboot the switch.

Cat_6509 (enable) clear config all

Please see other sections of this paper for cases when it is impractical to reset the switches tofactory defaults.

The Dell PowerConnect 6200 Series switch can support up to 18 different LAGs. A portchannel can have from zero to eight of the ports as members. Any external or internal port can be amember of a LAG. The examples in this document show different numbers of ports in a LAG.

It is recommended that you physically disconnect the ports to be aggregated on both the Ciscoand Dell switches during configuration. This will avoid any network loops being formed beforethe LAGs are set up.

CONFIGURING THE 62 00 SERIES SWITCH PORTS FOR DYNAMIC

LINK AGGREGATION

The following example shows the Dell PowerConnect 6200 Series switch CLI commands forconfiguring eight ports on the switch for LACP.

PC6248(config)# interface range ethernet 1/g17-1/g20

PC6248(config-if)# channel-group 1 mode auto

COMMAND DESCRIPTION

interface range ethernet 1/g17-1/g20 Sets the CLI mode to configure the eight Gigabit Ethernet ports(referred to in the command as 1/g17-1/g20, which stands

for Gigabit Ethernet ports 17 through 20 on unit 1).

Value ‘1’ in “1/g17 and 1/g20” specifies the unit number, thisnumber depends on the Stack unit number and can be between1 to 12. When used in a stacked environment, the member portsof the LAG can be chosen from across the stack units.

NOTE: All 4 ports do not have to be selected; a LAG can have0-8 ports depending on the requirements of the network (i.e themore ports in the LAG, the more bandwidth and moreredundancy that is available). A LAG can even be configuredwithout any member ports. When ports are added to the LAG,they will be set to the configuration of the LAG.

channel-group 1 mode auto Aggregates the four ports into a LAG (referred to in thecommand as channel-group), which will use LACP (referredto in the command as mode auto). The ‘1’ for the channel-groupnumber only has meaning within the switch and is used todifferentiate up to eighteen unique channel-groups. For eachLAG created, the user will need to choose a number betweenone and eighteen, for up to the maximum of eighteen groups.Both external and the internal ports can be part of LAG.



6APRIL 2008


To assign ports 1/g17 through 1/g20 to LAG 1 by using the Web interface, navigate to theSwitching > Link Aggregation > LAG Membership page.

In the Ports area, click the button under ports 1/g17 through 1/g20 in the LAG row.The number 1 appears to indicate that the port belongs to LAG 1. Click a button under port1/g17 (or any other LAG members) in the LACP row to use LACP on the port-channel. Theletter L appears in the row for all members. Click Apply Changes to save the settings to the

running configuration.

CONFIGURING A CISCO IOS GIGABIT ETHERNET SWITCH FOR DYNAMIC

LINK AGGREGATION

The following example shows the Cisco IOS switch CLI commands for configuring six portsfor LACP.

3750(config)# interface range GigabitEthernet 1/0/1 - 4

3750(config-if)# channel-protocol lacp

3750(config-if)# channel-group 1 mode active

COMMAND DESCRIPTION

interface range GigabitEthernet

1/0/1 – 6Sets the CLI mode to configure four Gigabit Ethernet ports(referred to in the command as GigabitEthernet

1/0/1 – 4, which stands for Gigabit Ethernet ports

1 through 4).

channel-protocol lacp Sets ports to use LACP as the LAG protocol (and not PAgP).

channel-group 1 mode active Aggregates the four ports into a LAG (referred to in thecommand as channel-group), which will use LACP

(referred to in the command as mode active). The ‘1’

for the channel-group number only has meaning within theswitch and is used to differentiate unique channel-groups.



7APRIL 2008


CONFIGURING A CISCO CATOS GIGABIT ETHERNET SWITCH FOR

DYNAMIC LIN K AGGREGATION

The following example shows the Cisco CatOS switch CLI commands for configuring six portsfor LACP.

Cat_6509(enable) set channelprotocol lacp 2Cat_6509(enable) set port lacp-channel 2/1-4 mode active

COMMAND DESCRIPTION

set channelprotocol lacp 2 Sets the LAG dynamic protocol to LACP on module 2 (module2 just happens to be the module that is in the switch used tovalidate the examples in this paper. Your switch may beconfigured differently).

set port lacp-channel 2/1-4 mode active Aggregates four ports on module 2 (referred to in the command as2/1–4, which stands for ports 1 through 6 on module 2) into a

LAG (referred to in the command as lacp-channel), which will

use LACP (referred to in the command as mode active).

NOTE: Only the Cisco mode active is supported for LACP interoperability with thePowerConnect 6200 Series switch. The other modes (passive, auto, on, desirable)

should not be used when using LACP between a Cisco switch and the PowerConnect 6200Series switch. Using a mode other than active is a common configuration error.

CONFIRMING A SUCCESSFUL DYNAMIC LINK AGGREGATION CONNECTION

WITH THE 6200 SERIES SWITCH

The following example shows how the PowerConnect 6200 Series show interfaces

port-channel 1 command can be used to assure that the 6200 Series switch has

established a LAG and that the LAG is connected.

PC6248#show interfaces port-channel 1

Channel Ports Hashing-mode

------- ------------------------------------------ ------------

ch1 Active: 1/g17, 1/g18, 3

Inactive: 1/g19, 1/g20

Hash algorithm type

1 - Source MAC, VLAN, EtherType, source module and port Id

2 - Destination MAC, VLAN, EtherType, source module and port Id

3 - Source IP and source TCP/UDP port

4 - Destination IP and destination TCP/UDP port

5 - Source/Destination MAC, VLAN, EtherType and source MODID/port

6 - Source/Destination IP and source/destination TCP/UDP port

The output of the command shows the ports 1/g17-1/g18 are “Active.” This confirms that thereis physical link on the ports 1/g17-1/g18 in the LAG and that the 6200 Series switch hascommunicated with the Cisco switch to successfully establish an aggregated link on ports1/g17-1/g18 with LACP. Ports 1/g19 and 1/g20 are shown as “Inactive” because there is nophysical link on 1/g19 and 1/g20 (i.e. these ports are not connected to the Cisco switch).



8APRIL 2008


CONFIRMING A SUCCESSFUL DYNAMIC LINK AGGREGATION

CONNECTION WITH CISCO IOS

The following example shows how the Cisco IOS show interfaces port-channel 1

etherchannel command can be used to assure that the Cisco has established a LAG and

that the LAG is connected.

3750# show interfaces port-channel 1 etherchannel

Port-channel1 (Primary aggregator)

Age of the Port-channel = 00d:01h:11m:34s

Logical slot/port = 10/1 Number of ports = 4

HotStandBy port = null

Port state = Port-channel Ag-Inuse

Protocol = LACP

Ports in the Port-channel:

Index Load Port EC state No of bits

------+------+------+------------------+-----------

0 00 Gi1/0/1 Active 0

0 00 Gi1/0/2 Active 0

0 00 Gi1/0/3 Active 0

0 00 Gi1/0/4 Active 0

The output of the command shows the ports Gi1/0/1 through Gi1/0/4 are “Active.” Thisconfirms that there is physical link on all ports in the LAG and that the Cisco switch hascommunicated with the PowerConnect 6200 Series switch to successfully establish anaggregated link on ports 1/0/1 through 1/0/4 with LACP.

CONFIRMING A SUCCESSFUL DYNAMIC LINK AGGREGATION

CONNECTION WITH CISCO CATOS

The following example shows how the Cisco CatOS show interfaces lacp-channel

info command can be used to assure that the Cisco switch has established a LAG and that

the LAG is connected.

Cat_6509> (enable) show lacp-channel info

Chan Port Status Channel Admin Speed Duplex Vlan

id mode group

---- ----- ---------- -------------------- ----- ----- ------ ----

801 2/1 connected active 395 a-1Gb a-full 1




. . .The output of the command shows the status for ports 2/1 through 2/4 is “connected” and thatthe channel mode is “active.” This confirms that there is physical link on all ports in the LAGand that the Cisco switch has communicated with the PowerConnect 6200 Series switch tosuccessfully establish an aggregated link on ports 2/1 through 2/4 with LACP.



9APRIL 2008


CONFIGURING THE 6200 SERIES PORTS FOR STATIC LINK AGGREGATION

The following example shows the PowerConnect 6200 Series Gigabit Ethernet switch CLIcommands for configuring three ports of the Gigabit Ethernet switch for static aggregation.Note that a LAG can be configured with 0-6 ports (the example uses 3), and a port may only bepart of a single LAG:


PC6248(config-if)# channel-group 1 mode on

COMMAND DESCRIPTION

interface range ethernet 1/g17-1/g19 Sets the CLI mode to configure three Gigabit Ethernet ports(1/g17, 1/g/18, and 1/g19).

channel-group 1 mode on Aggregates the three ports into a static LAG. Static LAGs do notuse LACP and are defined in the CLI by setting the channel-group mode to mode on. The ‘1’ for the channel-group number

only has meaning within the switch and is used to differentiateup to 18 unique channel-groups. For each LAG created, you willneed to choose a number from 1-18, for up to the maximum of18 groups. The internal ports that connect to the servers do not

support link aggregation groups.

To assign ports 1/g17 through 1/g19 to LAG 1 by using the Web interface, navigate to theSwitching > Link Aggregation > LAG Membership page.

In the Ports area, click the button under ports 1/g17 through 1/g19 in the LAG row. Thenumber 1 appears to indicate that the port belongs to LAG 1. Make sure the LACP option forthe ports is clear. Click Apply Changes to save the settings to the running configuration.



10APRIL 2008


CONFIGURING A CISCO IOS SWITCH FOR STATIC LI NK AGGREGATION

The following example shows the Cisco IOS CLI commands for configuring three ports of theCisco switch for static link aggregation.

3750(config)# interface range GigabitEthernet 1/0/9 - 11

3750(config-if)# channel-group 1 mode on

COMMAND DESCRIPTION

set channelprotocol lacp 2 Sets module 2 to use the LACP commands to configureLAGs. Since we are defining a static LAG, the setting for the

channelprotocol does not matter (more on this below).

port lacp-channel 2/9-11 mode on Configures the three Ethernet ports (2/9, 2/10, and 2/11) into astatic LAG. Static LAGs do not use LACP and are defined in theCisco CLI by setting the lacp-channel mode to on.

CONFIGURING A CISCO CATOS SWITCH FOR STATI C LINK AGGREGATION

The Cisco CatOS CLI allows the configuration of static LAGs via the LACP or the PAgP CLIcommands. Both commands are shown below.

The following example shows the Cisco CatOS CLI LACP channelprotocol commands for

configuring three ports of the Cisco switch for static link aggregation.

Cat_6509(enable) set channelprotocol lacp 2

Cat_6509(enable) set port lacp-channel 2/9-11 mode on

COMMAND DESCRIPTION

interface range GigabitEthernet 1/0/9 - 11 Sets the CLI mode to configure three Gigabit Ethernet ports(1/0/9, 1/0/10, and 1/0/11).

channel-group 1 mode on Aggregates the three ports into a static LAG. Static LAGs donot use LACP and are defined in the Cisco CLI by setting thechannel-group mode to ‘on’. The ‘1’ for the channel-group

number only has meaning within the switch and is used todifferentiate channel-groups. The number of channel-groupssupported by Cisco switches depends on the switch model.

The following example shows the Cisco CatOS CLI PAgP channelprotocol commands

for configuring three ports of the Cisco switch for static link aggregation using the PAgPcommand.

Cat_6509(enable) set channelprotocol pagp 2

Cat_6509(enable) set port channel 2/9-11 mode on



11APRIL 2008


COMMAND DESCRIPTION

set channelprotocol pagp 2 Sets module 2 to use the PaGP commands to configure LAGs.As mentioned previously, in defining a static LAG, the setting forthe channelprotocol does not matter.

set port channel 2/9-11 mode on Configures the three Ethernet ports (2/9, 2/10, and 2/11) into astatic LAG. Static LAGs do not use PAgP and are defined in theCisco CLI by setting the channel mode to on.

NOTE: The number of channel-groups supported by Cisco switches depends on the switchmodel.

CONFIRMING A SUCCESSFUL STATIC LINK AGGREGATION CONNECTION

Since LACP is not being used, only careful inspection of the Cisco and PowerConnect 6200Series configurations can confirm that a static LAG has been established. The following stepsmay be helpful:

• Make sure the cabling is attached to the correct ports on both switches

• Check that all LAG ports have link

• On the Dell and Cisco switches, use the show running-config command to

confirm that the desired ports are in the LAG:

ο PC6248# show running-config

ο 3750# show running-config

ο Cat_6509(enable) show running-config

LIN K A GGREGATION WITH CI SCO FAST ETHERNET SWITCHES

Some customers have an investment in a Cisco Fast Ethernet (100Mbps) network. In this casethe customer may not want to incur the expense to replace their Cisco Fast Ethernet switchesto match the highest speed of the Dell PowerConnect 6200 Series, but they still want to havethe most bandwidth possible. Since the Dell PowerConnect 6200 Series switchsupports auto-negotiation (on the external ports), there is nothing additional that a customermust do to connect aggregated links to a Cisco Fast Ethernet switch if link aggregation portson the Cisco switch are also set to auto negotiation.

The ports in a Dell PowerConnect 6200 Series LAG are set to auto-negotiation by default. Ifthe negotiation setting of the LAG has been changed due to a previous configuration of theswitch, use the following command to set the LAG ports back to auto-negotiation:


PC6248(config-if)# negotiation

To enable auto-negotiation on the ports, by using the Web interface, use the following steps:1. From the Switching > Ports > Port Configuration page, click Show All 2. Select the Edit option for port 1/g17 through 1/g203. Select Enable from the Auto Negotiation menu

4. Click Apply Changes



12APRIL 2008


To set the ports on a Cisco IOS switch to auto-negotiation, use the following commands:

2950(config)# interface range FastEthernet 0/1 - 3

2950(config-if)# speed auto

2950(config-if)# duplex auto

To set the ports on a Cisco CatOS switch to auto-negotiation, use the following command:

Cat_6509> (enable) set port speed 2/9-11 auto

If auto negotiation cannot be used, both the Dell PowerConnect LAG and the Cisco switchports in the LAG must be set to the same speed and duplex. One switch cannot be left inauto-negotiation mode and the other forced to a certain speed and duplex or intermittent linkfailures may occur.

On the Dell PowerConnect 6200 Series switch, each member port of the LAG (or range ofEthernet ports) can be forced to 100 Mbps with the following commands:


PC6248(config-if)# no negotiation

PC6248(config-if)# speed 100

PC6248(config-if)# duplex full

The no negotiation command means that there is no auto negotiation on the Ethernet

port(s). The speed 100 command sets the port(s) to 100Mbps. Use the duplex full

command to set the duplex mode to full. The 802.3ad standard requires all ports in a LAGto be full duplex.

To perform the same configuration by using the Web interface, select the Edit check box forports 1/g17 through 1/g20 on the Port Configuration Table and set the new port speed. Youmust set the Auto Negotiation to Disable in order to set the port speed.

Use the following commands to set the ports on the Cisco IOS switch to 100Mbps and full duplex:

2950(config)# interface range FastEthernet 0/1 - 3

2950(config-if)# speed 100

2950(config-if)# duplex full

Use the following commands to set the ports on the Cisco CatOS switch to 100Mbps and full duplex:

Cat_6509> (enable) set port speed 2/9-11 100

Cat_6509> (enable) set port duplex 2/9-11 full



13APRIL 2008


CONFIGURATION LIMI TATIONS

Ports to be aggregated must be configured so that they are compatible with the linkaggregation feature and with the partner switch to which they connect.

For the Dell PowerConnect 6200 Series switch, the following limitations apply to aggregated

ports. The commands to remove the configuration are shown below each limitation.• The port cannot belong to another LAG

• PC6248(config)# interface ethernet 1/g17

PC6248(config-if-1/g17)# no channel-group

• The port cannot be a mirrored portYou need to run the following command if the port 1/g17 is alreadyconfigured as a mirror destination port

• PC6248(config)#no monitor session 1 destination

interface

You need to run the following command if the port 1/g17 is alreadyconfigured as a mirror source port

• PC6248(config)#no monitor session 1 source

interface 1/g17

To check the configuration of the ports on the Dell PowerConnect 6200 Series switch, use theshow running-config command and look at the interface ethernet 1/gxx

configurations, where the xx indicates the port number.

In the following example, the no monitor session 1 destination interface

command must be issued on port 1/g17 before it can be added to a LAG.

PC6248(config-if-1/g17)#exit

PC6248(config)#exit

PC6248(config)#show running-config

!Current Configuration:

!System Description "PowerConnect M6220, 7.31.0.2, VxWorks5.5.1"

!System Software Version 7.31.0.2

!

Configure

monitor session 1 destination interface 1/g17

Exit

CISCO AND DELL PORT CONFIGURATION DIFFERENCES

On Cisco IOS and CatOS based switches, and also on PowerConnect 6200 Series switch,ports must be configured identically to be included in a LAG.

Cisco IOS based switches may have the ‘desirable’ and ‘passive’ mode options for the LAGsetting. The PowerConnect 6200 Series switch does not support this implementation. Do notuse the ‘desirable’ or ‘passive’ modes when configuring a LAG with a Dell PowerConnectswitch. Only use the ‘active’ (for LACP) or ‘on’ (for static) modes.

On the PowerConnect 6200 Series switch, when members are added to a LAG they areremoved from all existing VLAN memberships. When members are removed from a LAG theyare added back to the VLANs that they were previously members of as per the configurationfile. Note that a port’s VLAN membership can still be configured when it is a member of a LAG.

However, this configuration is only actually applied when the port leaves the LAG. Additionally,the port’s GVRP configuration is overridden by the LAG’s GVRP configuration. Upon leavingthe LAG, the port will restore its GVRP configuration. The LAG interface can be a member of aVLAN complying with IEEE 802.1Q.



14APRIL 2008


CISCO AND DELL LAG DISTRIBUTION CONFIGURATION

Switches can only control the distribution of outgoing traffic on LAG ports. The PowerConnect6200 Series switch supports six different distribution methods based on source and/ordestination MAC or IP addresses, source and/or destination TCP/UDP ports, and sourceport/module ID to decide which port or LAG a packet will travel. The default distribution is

based on the source IP and source TCP/UDP port.

The following list shows the distribution methods available on the PowerConnect 6200 Series switch:

1 - Source MAC, VLAN, EtherType, source module and port ID2 - Destination MAC, VLAN, EtherType, source module and port ID3 - Source IP and source TCP/UDP port4 - Destination IP and destination TCP/UDP port5 - Source/Destination MAC, VLAN, EtherType, source MODID/port6 - Source/Destination IP and source/destination TCP/UDP port

PC6248#configure

PC6248(config)#interface port-channel 1

PC6248(config-if-ch1)#hashing-mode 1

Cisco IOS and CatOS switches provide configuration options for changing the distribution oftraffic on LAG ports.

One of the following Cisco IOS commands may be useful if poor performance on the LAGfrom the Cisco IOS switch is observed. In the order listed, the commands will allow the user toconfigure the switch to distribute packets to ports in a LAG based on the destination IPaddress, destination Ethernet address, a combination of source and destination IP addresses,a combination of source and destination Ethernet addresses, source IP address, or sourceEthernet address.

3750(config)#port-channel load-balance dst-ip

3750(config)#port-channel load-balance dst-mac

3750(config)#port-channel load-balance src-dst-ip

3750(config)#port-channel load-balance src-dst-mac

3750(config)#port-channel load-balance src-ip

3750(config)#port-channel load-balance src-mac

One of the following Cisco CatOS commands may be useful if poor performance on the LAGfrom the Cisco CatOS switch is observed. In the order listed, the commands will allow the user

to configure the switch to distribute packets to ports in a LAG based on the destination IPaddress, destination Ethernet address, a combination of source and destination IP addresses,a combination of source and destination Ethernet addresses, source IP address, or sourceEthernet address.

Cat_6509> (enable) set port channel all distribution ip destination

Cat_6509> (enable) set port channel all distribution mac destination

Cat_6509> (enable) set port channel all distribution ip both

Cat_6509> (enable) set port channel all distribution mac both

Cat_6509> (enable) set port channel all distribution ip source

Cat_6509> (enable) set port channel all distribution mac source

Documents

Pwcnt Link Aggregation